Suction apparatus.



P. ROEMER. SUCTION APPARATUS. APPLICATION FILED FEB. 18, 1914.

l l 33, 1 84. Patented Mar. 23, 1915.

` amparan Roaman, or rnANxroa'r-on-THE-MAIN, GERMANY.

l sUcTIvoN Arramzrus, l

Specification of Letters Patent.

Patented Mar. 23; 1915.

Application led February 18, 1914. Serial No.- 819,536.

To all whom may concern Be it known that I, FRIEDRICH ROEMEB,

of 25 Rubenstrasse, Frankfort-on-the-Main,

Germany, a. subject ofthe German Em eror, have invented certain lnew and usefu Improvements in Suction Apparatus, of which the following is a specification. 1

In electric dust-suction apparatus employing centrifugal pumps the air sucked in is conducted to the pump blade up to the present in such a manner that an intermediary wall is arranged before-it, the opening of which connects up vto the central suction opening of the pump blade. i

In-order to obtain as tight a closing as possible, the opening of the pump blade and alsothat of the intermediate-wall are generally each provided with a cylindrical vcollar, both of which fit into each other concentricall'y with a certain amount of play.

As the above-mentioned intermediate wall is arranged directly at the casing of the apparatus, on the slightest shifting of the casmg a ainst the motor axis a mutual scrapingo the above mentioned collars is caused, and. in order to avoid this the play allowed between the collars insuch apparatus must be relatively great which brings about a comparatively great loss through the gap.

Further in such apparatus the disposition of. the motor is not suitable and the current 'the motor. I

The object o f the present invention conofair is not sufficiently utilized for cooling kktemplates considerable practical advantages over the above described devices and shown 1n diagram 1n the draw1ng.The

'electric motor 1s seen from the front of the carbon brushes and is shown partly in section atthe bottom in so far as this is necessary for demonstrating the object of the in-4 vention.

a is the motor, a1 the open motor bottom,`

y partly Visible and is shown resting upona spide a* formed in the motor bottom and which includesga central motor bottom and bearingboss. b is the pump blade which is rovided with a cylindrical collar bfwhich` 1s fitted over the cylindrical neck as of the motor casing allowing as little play as possible. Both the neck a and collar b1 are exactly concentric, with the motor axis and directly .connected with it by means of' the motor casing or the pump blade so that an eccentric shifting 'of these two parts is impossible and the. gap between the cylindrical collars can be kept extremely small. As the motor is'in this manner `formed with an air channel the further vadvantage is attained that the entire quantity of air sucked in by the pump blade passes through the interior of the motor as shown by arrows on the drawing, and consequently causes an effective cooling of the motor. A

, In orden that the motor may be placed as near as possible to the place at which the power orlswinging effect of the pump blade begins, the casinglthereof is provided with a rim a6 which renders an air tight connection possible with the apparatus casing through the use cfa suitable Washer al of the usual well-known elastic, felt, or equivalent types as shown.

In the form of execution shown the apparatus casing cuis provided with a hood c1` which also forms a pump blade casing an the above mentioned connection of the motor with the ,apparatus casing is simplified.

From the foregoing, it is thought that the many features and advantages of the present invention will be readily understood without Jfurther description, though it will be of course understood that changes in the size,

form, and proportion of 'the several partsl may be resorted to to suit varying circumstances without departing from the spirit or the scope of the appended claims.

Having thus described my invention and illustrated its use, what I claim as new and desire to secure by Letters Patent, is the following: t

1. In an apparatus'of the class described, the combination with a supporting casing, of a motor casing formed with an open neck portion, an `electric-motor having a shaft supported therein, and a centrifugal pump on the motor shaft comprising a casin g having a telescoping connection with the said neck portion of the motor casing to maintain the said pump concentric therewith.

2. In an apparatus of the class described, the combination with a supporting casing, including a Ahood, of a motor casing arranged within said supporting casing and having a bottom opening, a spider arranged within said opening and including a central bearing boss, anr electric-motor having a shaft journaled in said boss, and a centrifugal pump carried on the end of said Shaft and .communicating with the motor casing.

hood, und s, coller formed on s'a pump adapted fe ,telescope with the neck of the meiner casing isc maintein'the pump concentric therewith.

En witness Whereofhave hereunto se@ my bend in presence of two Witnesses,

iininnnicii neniinn.

Witnesses:

JEAN GRUND, CARL GRUND. 

